Symfony3: Binding Form to Entity Classes - php

Question

I'm creating a form using built-in Symfony3 services:
1) creating new class in AppBundle\Form which extends AbstractType
2) creating a form object in my controller (using createForm())
3) pushing that object directly to twig layer (by createView())
In my Entities direction I've got two classes, already mapped to database by ORM.
First one is User, and the second one is UserAttribute. User is related to UserAttribute by OneToMany annotation. Relationship looks like:
class UserAttr
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="User", inversedBy="userAttr" )
* #ORM\JoinColumn(nullable=false)
*/
private $user;
And from the User side:
class User
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\OneToMany(targetEntity="UserAttr", mappedBy="user")
* #ORM\JoinColumn(nullable=false)
*/
private $userAttr;
When I'm adding new fields (using $builder->add()) everything works fine if they are associated to User class properties. But if I'm doing the same with UserAttribute properties - symfony can't find get/set methods for that properties. I know - I can fix it by class User extends UserAttribute but probably that's not the point. Symfony must have another solution for that, probably I missed something.
Thanks for your time !
// SOLVED | there should be defined an EntityClassType as below:
$builder->add('credit',EntityType::class,array(
'class' => UserAttr::class
));

Answer 1

You have One-To-Many Association to UserAttr from User Entity. Hence, A User might have multiple credit.
OPTION 1 :
Considering this, you have to use a collection field type in UserFormType, which is a bit lengthy process.
$builder->add('userAttr', CollectionType::class, array(
'label' => false,
'allow_add' => true,
'allow_delete' => true,
'entry_type' => UserAttrType::class
));
Then create another FormType : UserAttrType to represent UserAttr where you can have the credit field as a property from UserAttr.
$builder
->add('credit', TextType::class, array(
'label' => 'Credit',
))
This way, The form will load and submit accordingly, The credit value will also be updated when User form gets updated. Here is a link for collection docs. This is how to embed a collection form.
OPTION 2 :
But, If you want to simplify it further, add mapped = false (doc) to the credit field. This will ignore the current error. However, you have to manually collect the credit value from Form Object and set value to appropriate UserAttr Object in Submit Handler.
Hope it helps!